From johnboos.com:
Q: How do I keep my cutting board sanitized?
A: Keep your Boos ® cutting board sanitized by simply washing it with hot soapy water after each use and dry it with a clean paper towel or let it air dry. If you want to sanitize the board more thoroughly, use a diluted mixture of chlorine bleach or vinegar solution that consist of one teaspoon of liquid chlorine bleach in one quart of water or a one to five dilution of vinegar. Do not soak or submerge the board in water, for this will disrupt the moisture content and cause the rails to split. Wood cutting boards are NOT dishwasher safe.
From cooksillustrated.com:
If you can’t use a dishwasher (which won’t work for wood, bamboo, and some composite boards), is bleaching the next best method for eliminating bacteria from your cutting board?
We sent a stack of boards to a lab, where they were colonized with salmonella, then washed with hot soapy water or sprayed with bleach solution or undiluted vinegar. All methods were equally effective at reducing bacteria to less than 10 CFUs (colony forming units).
We asked an outside lab to compare wood, plastic, bamboo, and composite cutting boards to see if any particular material harbored more bacteria after washing. Bamboo boards actually have antibacterial properties that help kill off bacteria, but all of the materials we tested came back perfectly clean.